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Electromagnetics Electromagnetism defined as magnetism produced by an electric current In other words it is the electricity part of what holds ourselves and every bit of matter in the universe together This source of universal glue is found within atoms themselves As the name sounds there are two different forces within electromagnetism - the electric force and the magnetic force Before the early part of the last century scientist studied electricity and magnetism as different sciences No one knew the connection between them Electromagnetism was found almost by accident that a flow of electric current a movement of electrical charge creates a magnetic force to use the words of Jack R White author of The hidden World of Forces I will first explain the magnetic force in electromagnetism Nearly 900 years ago the Chinese discovered the natural permanent magnet - lodestone or magnetite After playing around with this rock they discovered that when floating on a piece of wood it would always point itself north From this they then created a magnetic compass To the Chinese in that time magnetic force seemed to be magic but in the twentieth century we use magnetic fields everyday In such things as the refrigerator the washing machine the dryer and the vacuum cleaner all have electric motors The magnetic force can be created many different ways but the two main ones are Ferromagnetism - caused by the orientation direction of certain kinds of atoms Electromagnetism - caused by passing an electric current through a conductor such as metal wire Both of these magnetic fields once created is exactly the same Electromagnetic Radiation by definition is the transmission of energy in the form of waves having both an electric and a magnetic component It is impossible for a wave with just one or the other to exist The most common forms of electromagnetic radiation are radio waves and light waves The Theory of electromagnetic fields was developed
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